Question: What is the locomotive class with the most stroke whose operator is Lancashire, Derbyshire and East Coast Railway?
Paraphrase: What locomotive class has the most stroke operated by Lancashire, Derbyshire and East Coast Railway?
SPARQL (Wikidata): select ?ent where { ?ent wdt:P31 wd:Q19832486 . ?ent wdt:P2557 ?obj . ?ent wdt:P137 wd:Q6482976 } ORDER BY DESC(?obj)LIMIT 5 
Answer: LD&ECR Class A, LD&ECR Class D, LD&ECR Class B, LD&ECR Class C